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linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: ~90s reboot delay with v6.19 and PREEMPT_RT Date: Thu, 19 Feb 2026 17:46:47 +0100 Message-ID: <20260219164648.3014-1-spasswolf@web.de> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:1upwbBpQsXdSpVpry208YxqKiclRSvNT44NmQd6fzUmgiKROgNq Mk0HKp0rUFy4shSU4O8urekCf2h5B8pn8jBZsAtvKUZiN7ne9R0Tz+//0uzrZ0kC7I+Ptx7 VPAK+oet56qenk1eqFrHGv4uKqWHz307BJ/bQapQxO9f85fblQnBW1DrcA6aATNCUxTmc2A 3lBUDIKxoUDKM6QYSZujw== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:VhJ8yTEIeZE=;9bMvBXgtOvg+Q1cthULGIKV9eOV TVeJqMbCearGKjXyxnBJHRbaeXUSZiV1oH5S+FJZuR+KT+sRxc3McBEqBjFRXrB8pc7f8iGcR 8XfY3JdTZQHeMhtvuE+Bg3y7ybFCvKUklxHzCZsNFJpmGhevLEjx56iY5DVI0eqHzr8kVkkaM j5EXC5vyPtUIoJlNQQG7/EgC0UTiVayKl0f2HAFJZjUG4MqajjjqLur1qVelsadMwzpJTs7dz 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V89u9ZJ2F7iWf9Fleoiw5YrjqG7sNoPNDTGNtCkAMZ3YpQfvVeTPYwvSNWK9pfSIm7yX6jEdG ekPKPsJ3igXn5bJKbOvP/Ziwbpl/Ty/oxwvNolkffM/micHZfu7BTLdkc10gOpP8f+um4qSQr qnGoGnpNDVEwFY9MmqMqxuW8M80TTOqwNsfS4Q3EU23pqEY/RdNMiA0rt/AO3msTYp1OQ4uCv P4RhKaQtLRsJ8gHNT588u8LS0t5XaWheHmSEDz Since linux v6.19 I noticed that rebooting my MSI Alpha 15 Laptop would hang for about ~90s before rebooting. I bisected this (from v6.18 to v6.19) and got this as the first bad commit: 9311e6c29b34 ("cgroup: Fix sleeping from invalid context warning on PREEMPT_RT") Reverting this commit fixes the reboot delay but introduces these error (which also seem to make the system crash sometimes): [ T0] BUG: scheduling while atomic: swapper/0/0/0x00000002 Compiling the kernel without PREEMPT_RT also fixes the issue. I've test these commits from "git log --oneline v6.19 kernel/cgroup" This commit shows the reboot delay: 9311e6c29b34 cgroup: Fix sleeping from invalid context warning on PREEMPT_RT These commits show no reboot delay, but "scheduling while atomic" warnings and instability: be04e96ba911 cgroup/cpuset: Globally track isolated_cpus update b1034a690129 cgroup/cpuset: Ensure domain isolated CPUs stay in root or isolated partition 6cfeddbf4ade cgroup/cpuset: Move up prstate_housekeeping_conflict() helper 103b08709e8a cgroup/cpuset: Fail if isolated and nohz_full don't leave any housekeeping 55939cf28a48 cgroup/cpuset: Rename update_unbound_workqueue_cpumask() to update_isolation_cpumasks() b66c7af4d86d cgroup: use credential guards in cgroup_attach_permissions() d245698d727a cgroup: Defer task cgroup unlink until after the task is done switching out This commit shows neither the reboot delay nor the "scheduling while atomic" problem: 260fbcb92bbe cgroup: Move dying_tasks cleanup from cgroup_task_release() to cgroup_task_free() Bert Karwatzki